Whoa, where the hell did you grow up? Below a rock?
Anyway, to provide some answers:
1. Kissing (mouth to mouth, kissing her body)
There are infections that can be transmitted through saliva and making out. One of these is mononucleosis, also known as the kissing disease. It'll make you extremely tired for up to six months, but the disease is also infectious when using an improperly cleaned glass or someone talks and spits at the same time. This is nothing to be concerned about, as I believe I've seen estimates that up to 50 to 60% of the world population has been in contact with this disease. Most of the time you won't even notice it.
Nothing of serious concern.
2. Being naked together where touching is involved - cuddling, sleeping, showering together, swimming, using the jazcuzzi together
Uh wat? None of concern, because this is about the same as when you're wearing clothing. You can exchange all sorts of diseases like the flu.
3. touching each other's genitalls/masterbating together
You can get STDs through touching the genitals of others, esp. when you have little wounds on your hands or when you transfer the body fluids from your partner's body to yours(or vice versa). Chances of infection are usually extremely slim, yet it's smart to pay attention when you're putting on a condom to what parts of your d*ck you touch. You don't want pre-c*m end up on your finger tips and then proceed to finger her. This could cause pregnancy(altho extremely slim again).
4. oral sex (me giving her, she giving me)
Obviously this gives you a higher chance of contracting an STD, as you're exchanging body fluids with another person through your mouth. If you got little wounds in your mouth chances are even higher. You can get STDs without any wounds in your mouth due to extremely thin linings and soft tissue. Still relatively slim compared to full blown f*cking. Of course, if she has genital warts, you're getting get em too, in your face. SO CHECK THAT C*NT BEFORE SLIPPING YOUR TONGUE THROUGH IT.
5. sex - i know i need a condom here
Yea well, obvious chances of getting her knocked up, or getting an STD. For males, chances of getting an STD are somewhere between 50 and 70%. You can have sex and not get infected, mainly because infection occurs through little wounds on the head of your penis. If you're uncut the risks are the highest, cut people have a bit lower chance of infection, yet still pretty high. NEVER F*CK WITHOUT A CONDOM, AND ALWAYS SLIP ON THE CONDOM YOURSELF. Always take your own condom(so b*tches can't tamper with it and puncture it) and always put it on yourself so they can't damage it.